1/*-
2 * Copyright (c) 1994-1996 S�ren Schmidt
3 * All rights reserved.
4 *
5 * Based heavily on /sys/kern/imgact_aout.c which is:
6 * Copyright (c) 1993, David Greenman
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer
13 * in this position and unchanged.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * $FreeBSD: head/sys/i386/linux/imgact_linux.c 101771 2002-08-13 06:55:28Z jeff $
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/exec.h>
37#include <sys/imgact.h>
38#include <sys/imgact_aout.h>
39#include <sys/kernel.h>
40#include <sys/lock.h>
41#include <sys/mman.h>
42#include <sys/mutex.h>
43#include <sys/proc.h>
44#include <sys/resourcevar.h>
45#include <sys/vnode.h>
46
47#include <vm/vm.h>
48#include <vm/vm_kern.h>
49#include <vm/vm_param.h>
50#include <vm/pmap.h>
51#include <vm/vm_map.h>
52#include <vm/vm_extern.h>
53
54#include <i386/linux/linux.h>
55
56static int exec_linux_imgact(struct image_params *iparams);
57
58static int
59exec_linux_imgact(imgp)
60 struct image_params *imgp;
61{
62 const struct exec *a_out = (const struct exec *) imgp->image_header;
63 struct vmspace *vmspace;
64 vm_offset_t vmaddr;
65 unsigned long virtual_offset, file_offset;
66 vm_offset_t buffer;
67 unsigned long bss_size;
68 struct thread *td = curthread;
69 int error;
70
71 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
72 return -1;
73
74 /*
75 * Set file/virtual offset based on a.out variant.
76 */
77 switch ((int)(a_out->a_magic & 0xffff)) {
78 case 0413:
79 virtual_offset = 0;
80 file_offset = 1024;
81 break;
82 case 0314:
83 virtual_offset = 4096;
84 file_offset = 0;
85 break;
86 default:
87 return (-1);
88 }
89 bss_size = round_page(a_out->a_bss);
90#ifdef DEBUG
91 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n",
92 (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
93#endif
94
95 /*
96 * Check various fields in header for validity/bounds.
97 */
98 if (a_out->a_entry < virtual_offset ||
99 a_out->a_entry >= virtual_offset + a_out->a_text ||
100 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
101 return (-1);
102
103 /* text + data can't exceed file size */
104 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
105 return (EFAULT);
106 /*
107 * text/data/bss must not exceed limits
108 */
109 mtx_assert(&Giant, MA_OWNED);
110 if (a_out->a_text > maxtsiz ||
111 a_out->a_data + bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
112 return (ENOMEM);
113
114 VOP_UNLOCK(imgp->vp, 0, td);
115
116 /* copy in arguments and/or environment from old process */
117 error = exec_extract_strings(imgp);
118 if (error)
119 goto fail;
120
121 /*
122 * Destroy old process VM and create a new one (with a new stack)
123 */
124 exec_new_vmspace(imgp, VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS, USRSTACK);
125 vmspace = imgp->proc->p_vmspace;
126
127 /*
128 * Check if file_offset page aligned,.
129 * Currently we cannot handle misalinged file offsets,
130 * and so we read in the entire image (what a waste).
131 */
132 if (file_offset & PAGE_MASK) {
133#ifdef DEBUG
134 printf("imgact: Non page aligned binary %lu\n", file_offset);
135#endif
136 /*
137 * Map text+data+bss read/write/execute
138 */
139 vmaddr = virtual_offset;
140 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
141 a_out->a_text + a_out->a_data + bss_size, FALSE,
142 VM_PROT_ALL, VM_PROT_ALL, 0);
143 if (error)
144 goto fail;
145
146 error = vm_mmap(kernel_map, &buffer,
147 round_page(a_out->a_text + a_out->a_data + file_offset),
148 VM_PROT_READ, VM_PROT_READ, 0,
149 (caddr_t) imgp->vp, trunc_page(file_offset));
150 if (error)
151 goto fail;
152
153 error = copyout((caddr_t)(void *)(uintptr_t)(buffer + file_offset),
154 (caddr_t)vmaddr, a_out->a_text + a_out->a_data);
155
156 vm_map_remove(kernel_map, buffer,
157 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
158
159 if (error)
160 goto fail;
161
162 /*
163 * remove write enable on the 'text' part
164 */
165 error = vm_map_protect(&vmspace->vm_map,
166 vmaddr,
167 vmaddr + a_out->a_text,
168 VM_PROT_EXECUTE|VM_PROT_READ,
169 TRUE);
170 if (error)
171 goto fail;
172 }
173 else {
174#ifdef DEBUG
175 printf("imgact: Page aligned binary %lu\n", file_offset);
176#endif
177 /*
178 * Map text+data read/execute
179 */
180 vmaddr = virtual_offset;
181 error = vm_mmap(&vmspace->vm_map, &vmaddr,
182 a_out->a_text + a_out->a_data,
183 VM_PROT_READ | VM_PROT_EXECUTE,
184 VM_PROT_ALL,
185 MAP_PRIVATE | MAP_FIXED,
186 (caddr_t)imgp->vp, file_offset);
187 if (error)
188 goto fail;
189
190#ifdef DEBUG
191 printf("imgact: startaddr=%08lx, length=%08lx\n",
192 (u_long)vmaddr, a_out->a_text + a_out->a_data);
193#endif
194 /*
195 * allow read/write of data
196 */
197 error = vm_map_protect(&vmspace->vm_map,
198 vmaddr + a_out->a_text,
199 vmaddr + a_out->a_text + a_out->a_data,
200 VM_PROT_ALL,
201 FALSE);
202 if (error)
203 goto fail;
204
205 /*
206 * Allocate anon demand-zeroed area for uninitialized data
207 */
208 if (bss_size != 0) {
209 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
210 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
211 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
212 if (error)
213 goto fail;
214#ifdef DEBUG
215 printf("imgact: bssaddr=%08lx, length=%08lx\n",
216 (u_long)vmaddr, bss_size);
217#endif
218
219 }
220 /* Indicate that this file should not be modified */
221 mp_fixme("Unlocked v_flag access");
222 imgp->vp->v_vflag |= VV_TEXT;
223 }
224 /* Fill in process VM information */
225 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
226 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
227 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
228 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
229 (virtual_offset + a_out->a_text);
230
231 /* Fill in image_params */
232 imgp->interpreted = 0;
233 imgp->entry_addr = a_out->a_entry;
234
235 imgp->proc->p_sysent = &linux_sysvec;
236
237fail:
238 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
239 return (error);
240}
241
242/*
243 * Tell kern_execve.c about it, with a little help from the linker.
244 */
245static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
246EXEC_SET(linuxaout, linux_execsw);
2 * Copyright (c) 1994-1996 S�ren Schmidt
3 * All rights reserved.
4 *
5 * Based heavily on /sys/kern/imgact_aout.c which is:
6 * Copyright (c) 1993, David Greenman
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer
13 * in this position and unchanged.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * $FreeBSD: head/sys/i386/linux/imgact_linux.c 101771 2002-08-13 06:55:28Z jeff $
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/exec.h>
37#include <sys/imgact.h>
38#include <sys/imgact_aout.h>
39#include <sys/kernel.h>
40#include <sys/lock.h>
41#include <sys/mman.h>
42#include <sys/mutex.h>
43#include <sys/proc.h>
44#include <sys/resourcevar.h>
45#include <sys/vnode.h>
46
47#include <vm/vm.h>
48#include <vm/vm_kern.h>
49#include <vm/vm_param.h>
50#include <vm/pmap.h>
51#include <vm/vm_map.h>
52#include <vm/vm_extern.h>
53
54#include <i386/linux/linux.h>
55
56static int exec_linux_imgact(struct image_params *iparams);
57
58static int
59exec_linux_imgact(imgp)
60 struct image_params *imgp;
61{
62 const struct exec *a_out = (const struct exec *) imgp->image_header;
63 struct vmspace *vmspace;
64 vm_offset_t vmaddr;
65 unsigned long virtual_offset, file_offset;
66 vm_offset_t buffer;
67 unsigned long bss_size;
68 struct thread *td = curthread;
69 int error;
70
71 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
72 return -1;
73
74 /*
75 * Set file/virtual offset based on a.out variant.
76 */
77 switch ((int)(a_out->a_magic & 0xffff)) {
78 case 0413:
79 virtual_offset = 0;
80 file_offset = 1024;
81 break;
82 case 0314:
83 virtual_offset = 4096;
84 file_offset = 0;
85 break;
86 default:
87 return (-1);
88 }
89 bss_size = round_page(a_out->a_bss);
90#ifdef DEBUG
91 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n",
92 (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
93#endif
94
95 /*
96 * Check various fields in header for validity/bounds.
97 */
98 if (a_out->a_entry < virtual_offset ||
99 a_out->a_entry >= virtual_offset + a_out->a_text ||
100 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
101 return (-1);
102
103 /* text + data can't exceed file size */
104 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
105 return (EFAULT);
106 /*
107 * text/data/bss must not exceed limits
108 */
109 mtx_assert(&Giant, MA_OWNED);
110 if (a_out->a_text > maxtsiz ||
111 a_out->a_data + bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
112 return (ENOMEM);
113
114 VOP_UNLOCK(imgp->vp, 0, td);
115
116 /* copy in arguments and/or environment from old process */
117 error = exec_extract_strings(imgp);
118 if (error)
119 goto fail;
120
121 /*
122 * Destroy old process VM and create a new one (with a new stack)
123 */
124 exec_new_vmspace(imgp, VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS, USRSTACK);
125 vmspace = imgp->proc->p_vmspace;
126
127 /*
128 * Check if file_offset page aligned,.
129 * Currently we cannot handle misalinged file offsets,
130 * and so we read in the entire image (what a waste).
131 */
132 if (file_offset & PAGE_MASK) {
133#ifdef DEBUG
134 printf("imgact: Non page aligned binary %lu\n", file_offset);
135#endif
136 /*
137 * Map text+data+bss read/write/execute
138 */
139 vmaddr = virtual_offset;
140 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
141 a_out->a_text + a_out->a_data + bss_size, FALSE,
142 VM_PROT_ALL, VM_PROT_ALL, 0);
143 if (error)
144 goto fail;
145
146 error = vm_mmap(kernel_map, &buffer,
147 round_page(a_out->a_text + a_out->a_data + file_offset),
148 VM_PROT_READ, VM_PROT_READ, 0,
149 (caddr_t) imgp->vp, trunc_page(file_offset));
150 if (error)
151 goto fail;
152
153 error = copyout((caddr_t)(void *)(uintptr_t)(buffer + file_offset),
154 (caddr_t)vmaddr, a_out->a_text + a_out->a_data);
155
156 vm_map_remove(kernel_map, buffer,
157 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
158
159 if (error)
160 goto fail;
161
162 /*
163 * remove write enable on the 'text' part
164 */
165 error = vm_map_protect(&vmspace->vm_map,
166 vmaddr,
167 vmaddr + a_out->a_text,
168 VM_PROT_EXECUTE|VM_PROT_READ,
169 TRUE);
170 if (error)
171 goto fail;
172 }
173 else {
174#ifdef DEBUG
175 printf("imgact: Page aligned binary %lu\n", file_offset);
176#endif
177 /*
178 * Map text+data read/execute
179 */
180 vmaddr = virtual_offset;
181 error = vm_mmap(&vmspace->vm_map, &vmaddr,
182 a_out->a_text + a_out->a_data,
183 VM_PROT_READ | VM_PROT_EXECUTE,
184 VM_PROT_ALL,
185 MAP_PRIVATE | MAP_FIXED,
186 (caddr_t)imgp->vp, file_offset);
187 if (error)
188 goto fail;
189
190#ifdef DEBUG
191 printf("imgact: startaddr=%08lx, length=%08lx\n",
192 (u_long)vmaddr, a_out->a_text + a_out->a_data);
193#endif
194 /*
195 * allow read/write of data
196 */
197 error = vm_map_protect(&vmspace->vm_map,
198 vmaddr + a_out->a_text,
199 vmaddr + a_out->a_text + a_out->a_data,
200 VM_PROT_ALL,
201 FALSE);
202 if (error)
203 goto fail;
204
205 /*
206 * Allocate anon demand-zeroed area for uninitialized data
207 */
208 if (bss_size != 0) {
209 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
210 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
211 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
212 if (error)
213 goto fail;
214#ifdef DEBUG
215 printf("imgact: bssaddr=%08lx, length=%08lx\n",
216 (u_long)vmaddr, bss_size);
217#endif
218
219 }
220 /* Indicate that this file should not be modified */
221 mp_fixme("Unlocked v_flag access");
222 imgp->vp->v_vflag |= VV_TEXT;
223 }
224 /* Fill in process VM information */
225 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
226 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
227 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
228 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
229 (virtual_offset + a_out->a_text);
230
231 /* Fill in image_params */
232 imgp->interpreted = 0;
233 imgp->entry_addr = a_out->a_entry;
234
235 imgp->proc->p_sysent = &linux_sysvec;
236
237fail:
238 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
239 return (error);
240}
241
242/*
243 * Tell kern_execve.c about it, with a little help from the linker.
244 */
245static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
246EXEC_SET(linuxaout, linux_execsw);